// RSSMessage.java
// (C) 2007 by Michael Peter Christen; mc@yacy.net, Frankfurt a. M., Germany
// first published 16.07.2007 on http://yacy.net
//
// This is a part of YaCy, a peer-to-peer based web search engine
//
// $LastChangedDate: 2006-04-02 22:40:07 +0200 (So, 02 Apr 2006) $
// $LastChangedRevision: 1986 $
// $LastChangedBy: orbiter $
//
// LICENSE
// 
// This program is free software; you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation; either version 2 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA


package net.yacy.document.content;

import java.util.Date;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Map;
import java.util.Set;

public class RSSMessage {

    // statics for item generation and automatic categorization
    private static int guidcount = 0;

    public static enum Token {

        title("title"),
        link("link"),
        description("description"),
        pubDate("pubDate"),
        copyright("copyright,dc:publisher,publisher"),
        author("author,dc:creator,creator"),
        subject("subject,dc:subject"),
        category("category"),
        referrer("referrer,referer"),
        language("language"),
        guid("guid"),
        docs("docs");
        
        private Set<String> keys;
        
        private Token(String keylist) {
            String[] k = keylist.split(",");
            this.keys = new HashSet<String>();
            for (String s: k) this.keys.add(s);
        }
        
        public String valueFrom(Map<String, String> map) {
            String value;
            for (String key: this.keys) {
                value = map.get(key);
                if (value != null) return value;
            }
            return "";
        }
        
        public Set<String> keys() {
            return this.keys;
        }
    }
    
    public static final RSSMessage POISON = new RSSMessage("", "", "");
    
    public static final HashSet<String> tags = new HashSet<String>();
    static {
        for (Token token: Token.values()) {
            tags.addAll(token.keys());
        }
    }
    
    private final HashMap<String, String> map;

    public RSSMessage(final String title, final String description, final String link) {
        this();
        setValue("title", title);
        setValue("description", description);
        setValue("link", link);
        setValue("pubDate", new Date().toString());
        setValue("guid", Integer.toHexString((title + description + link).hashCode()));
    }
    
    public RSSMessage() {
        this.map = new HashMap<String, String>();
        this.map.put("guid", Long.toHexString(System.currentTimeMillis()) + ":" + guidcount++);
    }
    
    public void setValue(final String name, final String value) {
        map.put(name, value);
    }
    
    public String getTitle() {
        return Token.title.valueFrom(this.map);
    }
    
    public String getLink() {
        return Token.link.valueFrom(this.map);
    }
    
    public String getDescription() {
        return Token.description.valueFrom(this.map);
    }
    
    public String getAuthor() {
        return Token.author.valueFrom(this.map);
    }
    
    public String getCopyright() {
        return Token.copyright.valueFrom(this.map);
    }
    
    public String getCategory() {
        return Token.category.valueFrom(this.map);
    }
    
    public String[] getSubject() {
        String subject = Token.subject.valueFrom(this.map);
        if (subject.indexOf(',') >= 0) return subject.split(",");
        if (subject.indexOf(';') >= 0) return subject.split(";");
        if (subject.indexOf('|') >= 0) return subject.split("|");
        return subject.split(" ");
    }
    
    public String getReferrer() {
        return Token.referrer.valueFrom(this.map);
    }
    
    public String getLanguage() {
        return Token.language.valueFrom(this.map);
    }
    
    public String getPubDate() {
        return Token.pubDate.valueFrom(this.map);
    }
    
    public String getGuid() {
        return Token.guid.valueFrom(this.map);
    }
    
    public String getDocs() {
        return Token.docs.valueFrom(this.map);
    }
    
    public String getFulltext() {
        StringBuilder sb = new StringBuilder(300);
        for (String s: map.values()) sb.append(s).append(" ");
        return sb.toString();
    }
    
    public String toString() {
        return this.map.toString();
    }
}